31.7 What are Simple Machines | Learn about six simple machines

What is the definition of a machine?

• A tool used only for cutting objects

• Any device that helps us to do work

• A device that requires electricity to function

• A system that operates without human intervention

What does work result from?

• The outcome of a machine being turned on

• The effort of thinking about a problem

• The process of planning a task

• The result of a force moving an object

Which of the following is considered a machine?

• A stationary rock

• A baseball bat

• A cloud in the sky

• A pile of leaves

What is a simple machine?

• A machine with a few or no moving parts

• A machine that is easy to use

• A machine that is small in size

• A machine that can only perform simple tasks

How many kinds of simple machines are there?

• Four

• Three

• Six

• Eight

What is an inclined plane?

• A device that measures the incline of a hill

• A flat surface set at an angle to lift objects

• A type of lever

• A machine used to measure angles

What does a wedge do?

• Lifts cars off the ground

• Connects two pieces of wood

• Used to raise objects or split them apart

• Measures weight

What is a screw?

• A lever that has been straightened out

• A device for measuring pressure

• A type of inclined plane wrapped around a shaft

• A simple machine that uses gears

Which of the following is an example of a lever?

• A ramp

• A screwdriver

• A seesaw

• A wedge

What is the purpose of a pulley?

• To hold objects together

• To cut objects

• To measure distance

• To change the direction of a force